#nest.py
student1 = [20200901,'zhangsan',True,100,80]
student2 = [20200902,'lisi',False,90,80]
student3 = [20200903,'wangwu',True,70,80]
student4 = [20200904,'zhaoliu',True,50,80]
class1 = [student1,student2,student3,student4]
print('there are {} students in this class'.format(class1.__len__()))
first = class1[0]
first_name = first[1]
print("first student's name is {}".format(first_name))
print("second student's num is {}".format(class1[1][0]))